JDK14/Java14源码在线阅读
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#ifndef SHARE_INTERPRETER_BYTECODE_HPP
#define SHARE_INTERPRETER_BYTECODE_HPP
#include "interpreter/bytecodes.hpp"
#include "memory/allocation.hpp"
#include "oops/method.hpp"
#include "utilities/align.hpp"
#include "utilities/bytes.hpp"
class ciBytecodeStream;
// The base class for different kinds of bytecode abstractions.
// Provides the primitive operations to manipulate code relative
// to the bcp.
class Bytecode: public StackObj {
protected:
const address _bcp;
const Bytecodes::Code _code;
// Address computation
address addr_at (int offset) const { return (address)_bcp + offset; }
u_char byte_at(int offset) const { return *addr_at(offset); }
address aligned_addr_at (int offset) const { return align_up(addr_at(offset), jintSize); }
// Word access:
int get_Java_u2_at (int offset) const { return Bytes::get_Java_u2(addr_at(offset)); }
int get_Java_u4_at (int offset) const { return Bytes::get_Java_u4(addr_at(offset)); }
int get_aligned_Java_u4_at(int offset) const { return Bytes::get_Java_u4(aligned_addr_at(offset)); }
int get_native_u2_at (int offset) const { return Bytes::get_native_u2(addr_at(offset)); }
int get_native_u4_at (int offset) const { return Bytes::get_native_u4(addr_at(offset)); }
public:
Bytecode(Method* method, address bcp): _bcp(bcp), _code(Bytecodes::code_at(method, addr_at(0))) {
assert(method != NULL, "this form requires a valid Method*");
}
// Defined in ciStreams.hpp
inline Bytecode(const ciBytecodeStream* stream, address bcp = NULL);
// Attributes
address bcp() const { return _bcp; }
int instruction_size() const { return Bytecodes::length_for_code_at(_code, bcp()); }
Bytecodes::Code code() const { return _code; }
Bytecodes::Code java_code() const { return Bytecodes::java_code(code()); }
Bytecodes::Code invoke_code() const { return (code() == Bytecodes::_invokehandle) ? code() : java_code(); }
// Static functions for parsing bytecodes in place.
int get_index_u1(Bytecodes::Code bc) const {
assert_same_format_as(bc); assert_index_size(1, bc);
return *(jubyte*)addr_at(1);
}
int get_index_u2(Bytecodes::Code bc, bool is_wide = false) const {
assert_same_format_as(bc, is_wide); assert_index_size(2, bc, is_wide);
address p = addr_at(is_wide ? 2 : 1);
if (can_use_native_byte_order(bc, is_wide))
return Bytes::get_native_u2(p);
else return Bytes::get_Java_u2(p);
}
int get_index_u1_cpcache(Bytecodes::Code bc) const {
assert_same_format_as(bc); assert_index_size(1, bc);
return *(jubyte*)addr_at(1) + ConstantPool::CPCACHE_INDEX_TAG;
}
int get_index_u2_cpcache(Bytecodes::Code bc) const {
assert_same_format_as(bc); assert_index_size(2, bc); assert_native_index(bc);
return Bytes::get_native_u2(addr_at(1)) + ConstantPool::CPCACHE_INDEX_TAG;
}
int get_index_u4(Bytecodes::Code bc) const {
assert_same_format_as(bc); assert_index_size(4, bc);
assert(can_use_native_byte_order(bc), "");
return Bytes::get_native_u4(addr_at(1));
}
bool has_index_u4(Bytecodes::Code bc) const {
return bc == Bytecodes::_invokedynamic;
}
int get_offset_s2(Bytecodes::Code bc) const {
assert_same_format_as(bc); assert_offset_size(2, bc);
return (jshort) Bytes::get_Java_u2(addr_at(1));
}
int get_offset_s4(Bytecodes::Code bc) const {
assert_same_format_as(bc); assert_offset_size(4, bc);
return (jint) Bytes::get_Java_u4(addr_at(1));
}
int get_constant_u1(int offset, Bytecodes::Code bc) const {
assert_same_format_as(bc); assert_constant_size(1, offset, bc);
return *(jbyte*)addr_at(offset);
}
int get_constant_u2(int offset, Bytecodes::Code bc, bool is_wide = false) const {
assert_same_format_as(bc, is_wide); assert_constant_size(2, offset, bc, is_wide);
return (jshort) Bytes::get_Java_u2(addr_at(offset));
}
// These are used locally and also from bytecode streams.
void assert_same_format_as(Bytecodes::Code testbc, bool is_wide = false) const NOT_DEBUG_RETURN;
static void assert_index_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
static void assert_offset_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
static void assert_constant_size(int required_size, int where, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
static void assert_native_index(Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;
static bool can_use_native_byte_order(Bytecodes::Code bc, bool is_wide = false) {
return (!Endian::is_Java_byte_ordering_different() || Bytecodes::native_byte_order(bc /*, is_wide*/));
}
};
// Abstractions for lookupswitch bytecode
class LookupswitchPair {
private:
const address _bcp;
address addr_at (int offset) const { return _bcp + offset; }
int get_Java_u4_at (int offset) const { return Bytes::get_Java_u4(addr_at(offset)); }
public:
LookupswitchPair(address bcp): _bcp(bcp) {}
int match() const { return get_Java_u4_at(0 * jintSize); }
int offset() const { return get_Java_u4_at(1 * jintSize); }
};
class Bytecode_lookupswitch: public Bytecode {
public:
Bytecode_lookupswitch(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
// Defined in ciStreams.hpp
inline Bytecode_lookupswitch(const ciBytecodeStream* stream);
void verify() const PRODUCT_RETURN;
// Attributes
int default_offset() const { return get_aligned_Java_u4_at(1 + 0*jintSize); }
int number_of_pairs() const { return get_aligned_Java_u4_at(1 + 1*jintSize); }
LookupswitchPair pair_at(int i) const {
assert(0 <= i && i < number_of_pairs(), "pair index out of bounds");
return LookupswitchPair(aligned_addr_at(1 + (1 + i)*2*jintSize));
}
};
class Bytecode_tableswitch: public Bytecode {
public:
Bytecode_tableswitch(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
// Defined in ciStreams.hpp
inline Bytecode_tableswitch(const ciBytecodeStream* stream);
void verify() const PRODUCT_RETURN;
// Attributes
int default_offset() const { return get_aligned_Java_u4_at(1 + 0*jintSize); }
int low_key() const { return get_aligned_Java_u4_at(1 + 1*jintSize); }
int high_key() const { return get_aligned_Java_u4_at(1 + 2*jintSize); }
int dest_offset_at(int i) const;
int length() { return high_key()-low_key()+1; }
};
// Common code for decoding invokes and field references.
class Bytecode_member_ref: public Bytecode {
protected:
const Method* _method; // method containing the bytecode
Bytecode_member_ref(const methodHandle& method, int bci) : Bytecode(method(), method()->bcp_from(bci)), _method(method()) {}
const Method* method() const { return _method; }
ConstantPool* constants() const { return _method->constants(); }
ConstantPoolCache* cpcache() const { return _method->constants()->cache(); }
ConstantPoolCacheEntry* cpcache_entry() const;
public:
int index() const; // cache index (loaded from instruction)
int pool_index() const; // constant pool index
Symbol* klass() const; // returns the klass of the method or field
Symbol* name() const; // returns the name of the method or field
Symbol* signature() const; // returns the signature of the method or field
BasicType result_type() const; // returns the result type of the getfield or invoke
};
// Abstraction for invoke_{virtual, static, interface, special, dynamic, handle}
class Bytecode_invoke: public Bytecode_member_ref {
protected:
// Constructor that skips verification
Bytecode_invoke(const methodHandle& method, int bci, bool unused) : Bytecode_member_ref(method, bci) {}
public:
Bytecode_invoke(const methodHandle& method, int bci) : Bytecode_member_ref(method, bci) { verify(); }
void verify() const;
// Attributes
Method* static_target(TRAPS); // "specified" method (from constant pool)
Handle appendix(TRAPS); // if CPCE::has_appendix (from constant pool)
// Testers
bool is_invokeinterface() const { return invoke_code() == Bytecodes::_invokeinterface; }
bool is_invokevirtual() const { return invoke_code() == Bytecodes::_invokevirtual; }
bool is_invokestatic() const { return invoke_code() == Bytecodes::_invokestatic; }
bool is_invokespecial() const { return invoke_code() == Bytecodes::_invokespecial; }
bool is_invokedynamic() const { return invoke_code() == Bytecodes::_invokedynamic; }
bool is_invokehandle() const { return invoke_code() == Bytecodes::_invokehandle; }
bool has_receiver() const { return !is_invokestatic() && !is_invokedynamic(); }
bool is_valid() const { return is_invokeinterface() ||
is_invokevirtual() ||
is_invokestatic() ||
is_invokespecial() ||
is_invokedynamic() ||
is_invokehandle(); }
bool has_appendix();
int size_of_parameters() const;
private:
// Helper to skip verification. Used is_valid() to check if the result is really an invoke
inline friend Bytecode_invoke Bytecode_invoke_check(const methodHandle& method, int bci);
};
inline Bytecode_invoke Bytecode_invoke_check(const methodHandle& method, int bci) {
return Bytecode_invoke(method, bci, false);
}
// Abstraction for all field accesses (put/get field/static)
class Bytecode_field: public Bytecode_member_ref {
public:
Bytecode_field(const methodHandle& method, int bci) : Bytecode_member_ref(method, bci) { verify(); }
// Testers
bool is_getfield() const { return java_code() == Bytecodes::_getfield; }
bool is_putfield() const { return java_code() == Bytecodes::_putfield; }
bool is_getstatic() const { return java_code() == Bytecodes::_getstatic; }
bool is_putstatic() const { return java_code() == Bytecodes::_putstatic; }
bool is_getter() const { return is_getfield() || is_getstatic(); }
bool is_static() const { return is_getstatic() || is_putstatic(); }
bool is_valid() const { return is_getfield() ||
is_putfield() ||
is_getstatic() ||
is_putstatic(); }
void verify() const;
};
// Abstraction for checkcast
class Bytecode_checkcast: public Bytecode {
public:
Bytecode_checkcast(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }
// Returns index
long index() const { return get_index_u2(Bytecodes::_checkcast); };
};
// Abstraction for instanceof
class Bytecode_instanceof: public Bytecode {
public:
Bytecode_instanceof(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }
// Returns index
long index() const { return get_index_u2(Bytecodes::_instanceof); };
};
class Bytecode_new: public Bytecode {
public:
Bytecode_new(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }
// Returns index
long index() const { return get_index_u2(Bytecodes::_new); };
};
class Bytecode_multianewarray: public Bytecode {
public:
Bytecode_multianewarray(Method* method, address bcp): Bytecode(method, bcp) { verify(); }
void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }
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